CLASSIFICATION OF PALAMNAEUS (SCORPION)
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- ARTHROPODA (Jointed appendages.)
CLASS :- ARACHNIDA (Terrestrial or aquatic arthropods with book-lungs or trachea and without antennae, mandibles and jaws. )
ORDER :- SCORPIONIDA (Embolobranchiates in which the prosoma bealS 3-jointed chelicerae and chelate pedipals. )
FAMILY :- SCORPIONIDAE (Burrowing scorpions or pale-legged scorpions)
GENUS :- Palamnaeus (Scorpion)
It has cosmopolitan distribution and specially found in India, Europe and U.S.A.
HABIT AND HABITAT
It is a nocturnal arthropod, found in sand, crevices and under stones and in bark of dead trees. It feeds on insects and spiders which they often kill with the sting.
GENERAL CHARACTERSTICS OF PALAMNAEUS (SCORPION)
- Commonly called as scorpion.
- Body is elongated, segmented and differentiated into anterior prosoma and posterior opisthosoma.
- Coloration is dark in most species, often uniformly brown or black, sometimes with a greenish shine, with brighter-colored telson, walking legs, and/or pedipalp pincers in some species.
- Opisthosoma is sub-divided into a broad anterior mesosoma and a narrow posterior metasoma.
- Prosoma is covered dorsally by a carapace and its appendages are a pair of small chelate chelicerae, a pair of large chelate pedipalps, 4 pairs of walking legs and several ocelli.
- Body is encased in chitinous covering. The dorsal side covering is called as tergum, side one pleuron and ventral one sternum.
- Mesosoma is composed of 7 broad segments and metasoma of 5 narrow segments.
- Last metasomatic segment is telson containing a sting. Ventrally the sternum of first mesosomatic segment contains a pair of genital openings. The second meso somatic sternum bears a pair of sensory pectines, while third, fourth, fifth and sixth mesosomatic segments contain 4 pairs of bilateral stigmata, which are the openings of the respiratory booklungs. Metasoma is limbless.
- Just beneath chelicerae there are I and II gnathobases.
- Sexes are separate but without sexual dimorphism.
Scorpions are harmful to mankind; its sting causes extreme pain. fever and in some cases collapse. The sting has a poison duct from the sting gland present in telson. Other common forms are Buthus and Centrurus.
The animal has prosoma, mesosoma, metasoma and all above features, hence it is Scorpion.